Method of and apparatus for removing moisture from paper stock



May 13 1924.

A. J. HAUG METHOD OF AND APPARATUS FOR REMOVING MOISTURE FROM PAPERSTOCK Filed Jan. 11. 1923 IIIII'IIIIIIII atented May. 13, 1924.

UNITED STATES PATENT OFFICE.

ANTON J. HAUGQOF NASHUA, NEW HAMPSHIRE, ASSIGNOB TO DIPBOVED PAIEBHACHINIEBY COMPANY, OF NASHUA, NEW HAMPSHIRE, A CORPORATION OF MINE.

METHOD OF APPARATUS FOR REMOVING MOISTURE FROM PAPER STOCK.

Application filed January 11, 1828. Serial No. 612,083.

To all whom it may concern:

Be it known that I, ANTON J. Hum, a citizen of the United States, and aresident of Nashua, in the county of Hillsborough and State of NewHampshire, have invented an Improvement in Method of and Apparatus forRemoving Moisture from Paper Stock, of which the following description,in connection with the accompanying drawings, is a specification, likecharacters on the drawings representing like parts. I

This invention relates to paper making, and more particularly to methodsof and apparatus or handling a web or fibre layer while in a moist orformative stage and for removing the excess water therefrom.

The invention will be best understood by reference to the followingdescription when taken in connection with the accompanying illustrationshowing one s cific application thereof, while its scope W1 1 be moreparticularly pointed out in the appended claims.

In the drawings,- i

Fig. 1 is a sectional side elevation showingone type of web' formingmachine used in connection with one form of the invention; and

Fig. 2 is a longitudinal sectional elevation taken through theexpressing roll on the line .2- 2 in Fig. 1.

Referrin to the drawings, I have there shown for illustrative urposesone form of the invention embodied in an apparatus of the typeillustrated in my prior Patent No. 1,405,211, dated January 31, 1922,but the same may be adapted to various uses and applied to apparatus ofquite dissimilar type.

Referring more articularly to the specific embodiment of t e inventionhere illustrated, the same com rises a web forming apparatus which empoys a tank or casing 1 containing the chamber 2, to which the stock maybe fed in the usual manner, entering first the delivery chamber 3 andpassing over the bafile plate 4 to the tank space 2 where it isdelivered to the web carrying surface of the cylindrical screen drum orcylinder mold 5, the latter bein partly immersed in the stock and adaptto rotate in the direction of the arrow. The constructional details ofthis cylinder mold are immaterial and it may have any of the usualfeatures of apparatus of this class, the water being ordinarilycompelled to pass from the exterior of the cylinder to theinterior-thereof throu h a suitable foraminous or screening su ace, thescreened liquid or white water passing through a suitable dischargeorifice (not shown).

In the form of machine shown in Fig. 1, the web forming apparatus alsoincludes the couch roll 6 which rests in direct frictional contact withthe cylinder mold. The couch roll may be of any suitable constructionwhich is adapted to remove by pressure and direct contact with thecylinder mold the accumulated wet fibre thereon. It may be constructed,for example, of wood, covered with a woolen or felt jacket of suitablethickness to take up the fibre and to some extent extract the moisturetherefrom. The couch roll is preferably driven by frictional engagementwith the cylinder mold. The supporting bearings for the couch roll andthe cylinder-mold are not herein shown, but may be similar to thosedescribed in the aforesaid prior patent.

As the wet fibre sheet passes around the couch "roll it is subjected tothe action of means which serve to remove the water from the fibre byexpressing the same and causing it to drain away without interferencewith the continuing travel or advance of the fibre web or sheet. Hereinsuch means is embodied in the form of an expressing roll 7 having aporous or perforated surface and having provision for mechanicallypressing the two rolls together, so that the water forced out of thefibre is allowed to drain away in large part through the perforations inthe surface of the expressing roll. Preferably the surface of theexpress ng roll has a greater adhesive attraction for the fibre layerthan the couch roll or other sheet carrying member opposed thereto, sothat the water is not only expressed and withdrawn by the pressure ofthe perforated ro'll against the fibre, but the sheet is alsopicked upand carried by the presser roll and further drained in its passagethereover.

I have herein shown an expressing roll capable of withstandingconsiderable pressure, such, for example, as that described in myaforesaid prior patent, the same comprising a series of splders 8assembled upon the sleeve 9, the latter mounted on the shaft 10, thecircumferential edges of the spiders providing a series of supportingrings covings and supports for the expressing roll and couch roll arenot herein shown, but means are preferably provided, such as areillustrated in my aforesaid prior patent, whereby an adjustable pressuremay be maintained between the couch roll and the expressing roll as wellas between the couch roll and the cylinder mold.

In the apparatus shown in Fig, 1, the

partly drained web passes over the expressing roll and is then engagedbetween the latter and an imperforate presser roll 12, the latter beingpreferably so mounted that it may be adjustably pressed toward theexpressing roll, and having such a smooth hard surface that the fibresheet tends to.

adhere thereto and leave the perforated presser roll 7. The web passingtween the upper presser roll 12 and the expressing roll 7 has theremnant moisture effectively expressed therefrom and the water passesdown through the perforations of the roll to the interior thereof. Muchof the air as well as the moisture is expelled from the web so that thelatter clings to the roll 12 and, passing up and around the roll, isstripped therefrom by the doctor blade 13 to be conveyed therefrom toany other desired apparatus or utilized in any other desired way.

In the continued operation of this apparatus there is a tendency for thestock fibres to pass through the small perforations of the perforatedexpressing roll. tending to accumulate on the interior of the roll andfilling or clogging the perforations, thus in terfering with the mostefiicient functioning of the roll. To maintain the roll free from suchaccumulated fibre I have provided the underlying receptacle or trough 14immediately beneath the expressing roli and adapted to receive theliquid expressed from the web. At each end of the trough there is a|transverse partition wall 15 slightly lower than the edges of thetrough, thereby forming at each end an overflow pocket 16, the bottom 17of the pocket being inclined forwardly, as indicated in dotted lines illFig. 1, so that the overflow into the pocket is deflected back into thecylinder mold tank 2. The water expressed from the web maintains thebody of liquid in the trough at a level determined by the height of theedge wall 15, and is sufiicient to immerse the lower art of theperforated ex ressing roll, so that the part thereof from which the webhas been removed travels freely through the water in the trough. Thistends to wash the accumulated fibre free from the perforations and wallsof the expressing.

roll. The water draining through the expressing roll from the exteriorto the inte rior thereof creates a movement of the liquid from theinterior of the roll to the ends so that any stock which has entered theinterior of the roll is thereby washed out from the interior of the rollto the ends of the trough and carried back into the cylinder mold tank.The various rolls may be independently driven, but preferably thedriving power is applied to the perforated expressing roll, and theremaining rolls and cylinder mold are driven by frictional con tact. Thedescribed method permits the handling of a wet web of paper stock andthe extraction of the moisture therefrom without the use of a feltcarrier.

WVhile I have herein shown and described for the purposes ofillustration one specific form of the invention and one specificadaptation thereof, it is to be understood that the same may be variedwithin wide limits and that it may be usefully applied to widelydifferent forms of machines without departing from the spirit thereof,

Claims:

1. In a bination with a cylinder mold. a tank therefor, a couch roll, ahollow open ended perforated expressing roll pressed against the web onthe couch roll and adapted to pick up the web therefrom, an imperforateroll pressed against the web on the expressing roll and adapted to takethe web from the expressing roll, said expressing roll being adapted todrain the liquid from the web through the perforations of the roll, anda trough beneath the expressing roll adapted to, receive the liquidexpressed from the web and to discharge the same back to the tank, thelower part of said expressing roll being immersed in and travelingthrough said liquid and the water entering the interior of the rollthrough the perforations thereof being conveyed through the open ends ofthe roll and discharged back to the tank, whereby the expressing roll isfreed from accumulated fibre.

2. In a paper making apparatus for removing water from paper stock. thecombination with a perforated traveling surface, of a cooperative roll,said surface and roll being so related as to permit presentation betweenthem of stock from which the water is to be expressed and the roll andsurface being pressed toward each other to express the water from thestock and cause it to pass through the perforations of the surface.means to'remove the stock from the surface, and a receptacle adapted toreceive the water so expressed and presenting'a liquid body within thepath of the perforatedtraveling surface after the removal of the stocktherefrom.

In an apparatus for handling a moist fibre web in paper making, thecombination ,with a web carrying surface, of a hollow paper makingmachine, the comperforated roll pressed toward said surface and againstthe web thereon and adapted to take the web therefrom, and a troughbeneath the roll adapted to receive liquid expressed from the web, thelower part of said roll being immersed in said liquid.

4. In an apparatus for handling a moist fibre web in paper making, thecombination with means for conveying a formed web of a perforated hollowexpressing roll and a cooperating pressing roll between which the moistfibre web is conveyed and pressed, and a liquid container in which theexpressing roll is partly immersed.

5. In a paper making machine, the combination with a cylinder mold, of acouch roll, a hollow perforated expressing roll pressed against the webon the couch roll and adapted to take up the web therefrom, animperforate roll pressed against the web on the expressing roll andadapted to take the web from the expressing roll, and a receptacleadapted to receive the drained liquid and immerse the lower part of saidexpressing roll. 1

6. In a paper making machine, the combi nation with a cylinder mold of acouch roll, a hollow perforated expressing roll, and a receptacleadapted to receive the drained liquid and immerse the lower part of saidexpressing roll.

7. In a paper making machine, the combination with a web carryingsurface of a perforated roll adapted to take the web therefrom. apresser roll pressed toward said perforated roll and against the webthereon and adapted to take the web therefrom, and a receptable adaptedto receive the drained liquid and immerse the lower part .of saidexpressing roll therein.

8. In a paper making machine, the combination of a cylinder mold, acouch roll, a hollow perforated expressing roll pressed against the webon the couch roll and adapted to take the web therefrom, an imperfo rateroll pressed against the web on the expressing roll and adapted to takethe web from the expressing roll, and means for washing the roll freefrom accumulated tibre.

9. In a paper making machine, the combi- -of water drained from the web,a

nation of a web carrying surface, a perforated roll adapted to take theweb therefrom, a presser roll pressed toward the perforated roll andagainst the web thereon and adapted to take the web therefrom, and meansfor washing the perforated roll free from accumulated fibre.

10. In an apparatus for handling a moist fibre web in paper making, thecombination with means for conveying the formed web of a perforatedhollow expressing roll and a cooperating presser roll between which themoist fibre web is conveyed and pressed, and a liquid container adaptedto receive the liquid drained from the expressing roll, the lower partof said roll being immersed in an accumulation of such liquid.

11. In a paper making apparatus for removing water from paper stock, thecombination with means for conveying a moist fibre web of a perforatedtraveling surface and a cooperating roll between which said web isconveyed and pressed, the roll and surface being pressed toward eachother to express the water from the web and cause it to pass through theperforations of the surface, the water so expressed gravitating anddraining awayfrom the web, and a receptacle adapted to receive theaccumulation ortion of said surface when freed from said web travelingthrough said water, and means to withdraw the excess water therein.

12. The process of draining a continuous web of moist fibre whichconsists in conveying the, web on a perforated roll, applying pressi u'eto express water from the web, and causing the webless part of the rollto travel through the water drained from the web.

13. The process of draining a continuous web of moist fibre whichconsists in conveying the web on a perforated traveling surface,applying pressure to express the water therefrom, withdrawing the webfrom said. surface, and causing the weblessportion of said surface totravel through an accumulation of water drained from the'web.

In testimony whereof, I have signed my name to this specification.

ANTON J. HAUG.

